body{
	background-color: pink;
}

p{
	background-color: white;
	font-family: arial;
	font-size: 20px;
}

/*不同元素的背景可以设置不同*/
div{
	height: 300px;
	background-color: #cccccc;
	/* 使用png作为背景图片*/
	background-image: url('img/img_tree.png');
	background-repeat: no-repeat;
	background-position: right top;
}

.div_center{
	background-image: url('img/img_tree.png');
	background-position: left top;	
	border: 1px solid gray;
	margin-left: auto;
	width: 90%;
	text-align: center;
	padding: 8px;
}